EP1778451B1 - Mould for the injection moulding of a plastic piece and moulding method - Google Patents

Mould for the injection moulding of a plastic piece and moulding method Download PDF

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Publication number
EP1778451B1
EP1778451B1 EP05798601A EP05798601A EP1778451B1 EP 1778451 B1 EP1778451 B1 EP 1778451B1 EP 05798601 A EP05798601 A EP 05798601A EP 05798601 A EP05798601 A EP 05798601A EP 1778451 B1 EP1778451 B1 EP 1778451B1
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EP
European Patent Office
Prior art keywords
mould
wall
retractable
retractable wall
plastics material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP05798601A
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German (de)
French (fr)
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EP1778451A1 (en
Inventor
Annabelle Roy-Martinache
Alain Di Rienzo
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Faurecia Interieur Industrie SAS
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Faurecia Interieur Industrie SAS
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Publication of EP1778451A1 publication Critical patent/EP1778451A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B29C45/1639—Removable partitions between adjacent mould cavity portions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/33—Moulds having transversely, e.g. radially, movable mould parts

Definitions

  • the present invention relates to the injection molding of a plastic part comprising at least two adjacent parts made of two plastics of different natures and / or colors.
  • plastic parts and in particular parts for interior cladding of a motor vehicle, comprise several adjacent parts of different colors or aspects. These parts are obtained for example by injection molding parts in a mold in which it has previously placed skin appearance of different colors or textures. Such a method has the drawback of requiring numerous operations and in particular the preparation of appearance skins corresponding to the parts of natures and / or different colors.
  • molds whose molding cavity can be divided into several parts by means of a movable wall or a movable blade, which can be retracted.
  • the movable wall is first disposed in an extended position such as to divide the molding cavity into two parts, and a first plastic material is injected into a first portion of the molding cavity.
  • the movable wall is moved to a retracted position, which communicates the second portion of the mold cavity with the portion that has already been filled with plastic by injection.
  • a second plastic material is then injected into the second portion of the molding cavity. This second plastic material comes into contact with the already solidified plastic material and adheres to this first plastic material by welding.
  • Such methods are known for example from US 2003/0205915 or US 2002/0167816 .
  • This technique has a drawback because it is not suitable only for parts whose walls are flat. Indeed, to ensure a good seal of the two parts of the mold cavity defined by the movable wall, it is necessary to use a movable wall, one of whose edges comes into close contact with a surface of the molding cavity in the position d extension and which, in the retracted position, adapts perfectly to the second surface of the molding cavity. This arrangement requires in particular that the molding cavity is flat at least in the region of contact with the edge of the movable wall. This constraint constitutes a limitation and a disadvantage, since it is often desirable to make plastic parts comprising several adjacent parts of different natures and / or colors, having non-planar surfaces.
  • the object of the present invention is to remedy this drawback by proposing a means for injection molding a plastic part comprising at least two adjacent parts made of two plastics of different natures and / or colors in order to produce a part having non-planar walls.
  • the subject of the invention is a mold for injection molding of a plastic part comprising at least two adjacent parts made of two compatible plastics and assembled together by welding or gluing, of natures and / or of different colors, the mold comprising a molding cavity delimited by at least two non-planar walls, and at least one retractable wall movable between an extended position and a retracted position for dividing the molding cavity into at least two compartments can be powered separately plastic.
  • the retractable wall In the extended position, the retractable wall has a non-rectilinear ridge cooperating without clearance with a wall of the molding cavity, and the retractable wall comprises a plurality of contiguous panels in at least the extension position or the retracted position, said panels being movable relative to each other so as to be able to modify the shape of the non-rectilinear edge of the retractable wall to adapt it to the shape of a second wall of the cavity in the retracted position.
  • the retractable wall comprises at least three non-collinear portions and the retractable wall comprises at least one panel that can be moved between the extended position and the retracted position by two successive movements in two different directions.
  • the edge of the retractable wall comprises, for example, a central portion in the shape of a segment extended at its two ends by end arches non-collinear with the central segment, and in the extended position, the retractable wall comprises two side panels separated by a panel. central retractable, the side panels being movable in two perpendicular directions so as to be moved to a retracted position by two successive movements in two different directions.
  • the mold may include a plurality of retractable walls.
  • the plastic part of non-planar shape comprising at least two adjacent parts, made of plastics material of nature and / or of different colors, may have a junction zone delimited by two non-rectilinear lines, in projection in a section plane transverse, not being deduced from each other by translation, and is for example a facing element of the inside or outside of a motor vehicle.
  • the mold usually spotted by 1 at the Figure 1A has a molding cavity 2 delimited by a lower non-planar wall 3 and an upper non-planar wall 4 generally parallel to each other.
  • the molding cavity 2 is divided by a retractable wall 5 into a first molding compartment 6, and a second molding compartment 7, each fed by a tap hole 8 for the compartment 6, and 9 for the molding compartment 7.
  • the retractable wall 5, in the extended position as shown in FIG. Figure 1A or at Figure 2A consists of three adjacent panels: two end panels 10 and 11, separated by a central panel 12.
  • the three panels 10, 11 and 12 adjacent to each other define an upper edge 13, which comes into contact with the upper wall 4 of the mold.
  • the two molding compartments 6 and 7 are completely separated. It is then possible to inject a plastic material via a first taphole 8 for example, as indicated by the arrow shown in FIG. Figure 1A to form a first part 15 of a plastic part.
  • the central panel 12 of the retractable wall 5 can be moved downwards as indicated by the vertical arrow, which frees a space between the side panels 10 and 11 and makes it possible to move them laterally along the two horizontal arrows shown in FIG. the Figure 1B or 2B to bring them closer to each other.
  • the central movable panel 12 has an upper portion 12 'whose width is twice the thickness of the molding cavity 2 in its lateral end portions, so that once the central panel 12 is retracted and the panels 10 and 11 closer to be brought into contact with each other in the central portion, all of the panels 10 and 11 can be moved vertically as shown in FIGS. Figures 1C and 2C , by a movement according to the two arrows vertical. As a result of this movement and as represented Figures 1D or 2D , the side panels 10 and 11 then form a retracted wall whose upper edge 14 fits exactly the shape of the lower non-planar wall 3 of the molding cavity 2. In this arrangement which corresponds to the retracted position for the retractable wall 5, the upper edge 14 of the retractable wall in the retracted position completes the non-flat bottom wall 3 of the mold.
  • the second molding compartment 7 is delimited by the two non-planar walls 3 and 4 of the mold, the upper edge 14 of the retractable wall in the retracted position, and by the first part 15 of the part which is contained in the first compartment 6 in which plastic has already been injected. It is then possible to inject by the second taphole 9 a second plastic material of different color or nature from the first plastic material in order to constitute the second part of the plastic part comprising two parts of different colors or natures. This second part 16, is welded on the first part 15 of the piece.
  • the molding cavity 2 is separated into two molding compartments 6 and 7 by positioning the retractable wall 5 in the extended position.
  • the retractable wall 5 consists of three adjacent panels, and its upper edge 13 comes into contact with the upper non-planar wall 4 of the molding cavity 2.
  • a first plastic material is then injected by the first taphole 8 in the first compartment 6, and then allowed to cool or solidify the plastic material which has been injected to form the first part 15 of the plastic part.
  • the wall 5 is then retracted by bringing it into a retracted position in which its upper edge 14 complements the lower non-planar wall 3 of the molding cavity 2.
  • the shape of the upper edge of the wall is modified. retractable starting by retracting the central panel 12, which then allows to bring the two side panels 10 and 11 by a first horizontal movement and then moving these two panels down by a second vertical movement.
  • an upper edge 14 of the retractable wall is obtained which is both continuous and perfectly adapted to the lower non-planar wall 3 of the molding cavity 2.
  • the second molding compartment 7 is delimited at one of these ends by the first part 15 of the plastic part.
  • the second pouring hole 9 is then injected with a second plastic material which is chosen to be compatible and weldable with the plastics material of the first part, but which may have different properties because special additives have been added thereto, or which may be of different color, or which may both be of different color and have different additives.
  • This plastic material injected into the second compartment forms the second part 16 of the plastic part.
  • the cooling or solidification of the first injected plastic material is partial, so that the first material remains sufficiently ductile to the core so that, when the injection of the second material, there is a greater or lesser interpenetration of the two materials.
  • a weld is obtained, that is to say an interpenetration of the two materials or a bond, that is to say a surface adhesion between the two materials by superficial melting.
  • PP is more fluid than ABS and at equivalent temperature, PP forms a weld while ABS forms a bond.
  • the walls 3 or 4 of the first and second molding compartments may have, for example, different surface aspects so as to give different polishing or graining aspects to the two parts of the plastic part.
  • the upper edge 13 of the retractable wall 5, when this wall is in the extended position, comprises three non-collinear portions which are on the one hand a central segment 20, and on the other hand two lateral terminal arcs. 21 and 22, which extend in directions perpendicular to the central segment 20.
  • the lower edge 14 of the retractable wall 5, when in the retracted position, comprises three non-collinear portions, which are one part a central segment 20 ', and secondly two lateral terminal arcs 21' and 22 'which are non-collinear with the central segment 20'.
  • the segments 20 and 20 ' are parallel to one another, but that the segment 20' is shorter than the segment 20, and that the terminal arcs 21 'and 22' can be deduced from the arcs terminals 21 and 22 by translations. It is because of these provisions that the molding cavity 2 can be perfectly separated by a retractable wall 5 variable geometry as just described.
  • the mold which has just been described has two adjacent molding compartments making it possible to produce a part comprising two adjacent parts of different natures and / or colors. But it is obvious that one can envisage a mold having more than two adjacent molding compartments separated in pairs by retractable walls. It is thus possible to produce plastic parts comprising more than two adjacent parts of different natures and / or colors, and for example three adjacent parts or four parts or even more.
  • the shape of the piece 30 as shown in FIG. figure 3 is a part comprising a wall consisting of a flat panel terminated by rounded lateral edges extending perpendicular to the connecting line between the two parts of natures or of different colors.
  • Such a part comprising several flat panels but which are not parallel to each other, is a non-planar part which, to be molded in a mold consisting of a molding cavity that can be separated into several compartments by at least one retractable wall, requires also retractable walls consisting of a plurality of panels movable relative to each other movable to form walls having a first shape in an extended position and a different shape in a retracted position.
  • retractable walls consisting of a plurality of panels movable relative to each other movable to form walls having a first shape in an extended position and a different shape in a retracted position.
  • the method which has just been described can be used to manufacture a wide variety of plastic parts comprising several adjacent parts made of compatible plastics and assembled together by welding or gluing, but of different natures and / or colors. These parts are for example parts of automotive dashboards, or parts of interior door siding of automobiles, or any other piece of plastic interior or exterior of automobiles.
  • the method and the mold which have just been described are more particularly of interest for making parts comprising at least two parts of different natures or colors having non-planar surfaces and in which, moreover, these two parts have a zone of junction delimited by lines on the upper and lower walls of the part, non-rectilinear, in orthogonal projection on a cross-sectional plane (plane of the Figure 3 ), and can not be deduced from each other by a translation parallel to the plane of movement of the contiguous panels of the retractable wall of the mold.
  • a non-rectilinear junction line may be, in projection, at least partially curved or broken line.
  • the cross-sectional plane is a plane extending according to the thickness of the part, at least partially containing the joining surface.
  • the junction zone may have any shape, provided that it is compatible with the movements of the retractable wall. Those skilled in the art know how to determine these compatibility conditions.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Finishing Walls (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

A mould is provided for the injection molding of a plastic piece that includes at least two adjacent parts of two compatible plastic materials, assembled to one another by welding or gluing, of different types and/or colors. The mould includes a mould cavity defined by at least two non-planar walls and at least one retractable wall movable between extended and retracted positions, dividing the mould cavity into at least two compartments supplied separately with plastic. When extended, a non-linear edge of the retractable wall cooperates with a wall of the mould cavity in a play-free manner. The retractable wall includes panels joined in at least the extended or retracted position, movable in relation to one another so they can modify the shape of the non-linear edge of the retractable wall to adapt it to the shape of a second wall of the cavity in the retracted position.

Description

La présente invention est relative au moulage par injection d'une pièce en matière plastique comportant au moins deux parties adjacentes constituées de deux matières plastiques de natures et/ou de couleurs différentes.The present invention relates to the injection molding of a plastic part comprising at least two adjacent parts made of two plastics of different natures and / or colors.

Certaines pièces en matière plastique, et en particulier des pièces de parement intérieur de véhicule automobile, comportent plusieurs parties adjacentes de couleurs ou d'aspects différents. Ces pièces sont obtenues par exemple en moulant par injection des pièces dans un moule dans lequel on a placé au préalable des peaux d'aspect de couleurs ou de textures différentes. Un tel procédé présente l'inconvénient de nécessiter de nombreuses opérations et notamment la préparation de peaux d'aspect correspondant aux parties de natures et/ou de couleurs différentes.Certain plastic parts, and in particular parts for interior cladding of a motor vehicle, comprise several adjacent parts of different colors or aspects. These parts are obtained for example by injection molding parts in a mold in which it has previously placed skin appearance of different colors or textures. Such a method has the drawback of requiring numerous operations and in particular the preparation of appearance skins corresponding to the parts of natures and / or different colors.

Pour réaliser de telles pièces, on peut utiliser également des moules dont la cavité de moulage peut être divisée en plusieurs parties à l'aide d'une paroi mobile ou d'une lame mobile, que l'on peut escamoter. Dans de tels moules, on dispose d'abord la paroi mobile dans une position d'extension telle qu'elle divise la cavité de moulage en deux parties, et on injecte une première matière plastique dans une première partie de la cavité de moulage. Après solidification de la matière plastique injectée, on déplace la paroi mobile pour l'amener dans une position de retrait, qui met en communication la deuxième partie de la cavité de moulage avec la partie qui a déjà été remplie de matière plastique par injection. On injecte alors une deuxième matière plastique dans la deuxième partie de la cavité de moulage. Cette deuxième matière plastique vient au contact de la matière plastique déjà solidifiée et adhère à cette première matière plastique par soudage. De tels procédés sont connus par exemple de US 2003/0205915 ou de US 2002/0167816 .To make such parts, it is also possible to use molds whose molding cavity can be divided into several parts by means of a movable wall or a movable blade, which can be retracted. In such molds, the movable wall is first disposed in an extended position such as to divide the molding cavity into two parts, and a first plastic material is injected into a first portion of the molding cavity. After solidification of the injected plastics material, the movable wall is moved to a retracted position, which communicates the second portion of the mold cavity with the portion that has already been filled with plastic by injection. A second plastic material is then injected into the second portion of the molding cavity. This second plastic material comes into contact with the already solidified plastic material and adheres to this first plastic material by welding. Such methods are known for example from US 2003/0205915 or US 2002/0167816 .

Cette technique présente un inconvénient car elle n'est adaptée qu'à des pièces dont les parois sont planes. En effet, pour assurer une bonne étanchéité des deux parties de la cavité de moulage délimité par la paroi mobile, il est nécessaire d'utiliser une paroi mobile dont une des arêtes vient en contact étroit avec une surface de la cavité de moulage en position d'extension et qui, en position de retrait, s'adapte parfaitement à la deuxième surface de la cavité de moulage. Cette disposition nécessite en particulier que la cavité de moulage soit plane au moins dans la zone de contact avec l'arête de la paroi mobile. Cette contrainte, constitue une limitation et un inconvénient, puisqu'il est souvent souhaitable de réaliser des pièces en matière plastique comportant plusieurs parties adjacentes de natures et/ou de couleurs différentes, ayant des surfaces non planes.This technique has a drawback because it is not suitable only for parts whose walls are flat. Indeed, to ensure a good seal of the two parts of the mold cavity defined by the movable wall, it is necessary to use a movable wall, one of whose edges comes into close contact with a surface of the molding cavity in the position d extension and which, in the retracted position, adapts perfectly to the second surface of the molding cavity. This arrangement requires in particular that the molding cavity is flat at least in the region of contact with the edge of the movable wall. This constraint constitutes a limitation and a disadvantage, since it is often desirable to make plastic parts comprising several adjacent parts of different natures and / or colors, having non-planar surfaces.

Le but de la présente invention est de remédier à cet inconvénient en proposant un moyen pour mouler par injection une pièce en matière plastique comportant au moins deux parties adjacentes constituées de deux matières plastiques de natures et/ou de couleurs différentes afin de réaliser une pièce ayant des parois non planes.The object of the present invention is to remedy this drawback by proposing a means for injection molding a plastic part comprising at least two adjacent parts made of two plastics of different natures and / or colors in order to produce a part having non-planar walls.

A cet effet, l'invention a pour objet un moule pour moulage par injection d'une pièce en matière plastique comportant au moins deux parties adjacentes constituées de deux matières plastiques compatibles et assemblées entre elles par soudage ou par collage, de natures et/ou de couleurs différentes, le moule comprenant une cavité de moulage délimitée par au moins deux parois non planes, et au moins une paroi escamotable mobile entre une position d'extension et une position de retrait permettant de diviser la cavité de moulage en au moins deux compartiments pouvant être alimentés séparément en matière plastique. En position d'extension la paroi escamotable a une arête non rectiligne coopérant sans jeu avec une paroi de la cavité de moulage, et la paroi escamotable comprend une pluralité de panneaux jointifs dans au moins la position d'extension ou la position de retrait, lesdits panneaux étant mobiles les uns par rapport aux autres de façon à pouvoir modifier la forme de l'arête non rectiligne de la paroi escamotable pour l'adapter à la forme d'une deuxième paroi de la cavité dans la position de retrait.For this purpose, the subject of the invention is a mold for injection molding of a plastic part comprising at least two adjacent parts made of two compatible plastics and assembled together by welding or gluing, of natures and / or of different colors, the mold comprising a molding cavity delimited by at least two non-planar walls, and at least one retractable wall movable between an extended position and a retracted position for dividing the molding cavity into at least two compartments can be powered separately plastic. In the extended position, the retractable wall has a non-rectilinear ridge cooperating without clearance with a wall of the molding cavity, and the retractable wall comprises a plurality of contiguous panels in at least the extension position or the retracted position, said panels being movable relative to each other so as to be able to modify the shape of the non-rectilinear edge of the retractable wall to adapt it to the shape of a second wall of the cavity in the retracted position.

De préférence, la paroi escamotable comprend au moins trois portions non colinéaires et la paroi escamotable comporte au moins un panneau pouvant être déplacé entre la position d'extension et la position de retrait par deux mouvements successifs selon deux directions différentes.Preferably, the retractable wall comprises at least three non-collinear portions and the retractable wall comprises at least one panel that can be moved between the extended position and the retracted position by two successive movements in two different directions.

L'arête de la paroi escamotable comporte par exemple une portion centrale en forme de segment prolongée à ses deux extrémités par des arcs terminaux non colinéaires au segment central, et en position d'extension, la paroi escamotable comporte deux panneaux latéraux séparés par un panneau central escamotable, les panneaux latéraux étant mobiles selon deux directions perpendiculaires de façon à pouvoir être déplacés dans une position de retrait par deux mouvements successifs selon deux directions différentes.The edge of the retractable wall comprises, for example, a central portion in the shape of a segment extended at its two ends by end arches non-collinear with the central segment, and in the extended position, the retractable wall comprises two side panels separated by a panel. central retractable, the side panels being movable in two perpendicular directions so as to be moved to a retracted position by two successive movements in two different directions.

Le moule peut comporter une pluralité de parois escamotables.The mold may include a plurality of retractable walls.

L'invention concerne également un procédé pour fabriquer une pièce en matière plastique comportant au moins deux parties adjacentes constituées de matières plastiques de natures et/ou de couleurs différentes par moulage dans un moule selon l'invention. Selon le procédé, on peut :

  • mettre en position d'extension au moins une paroi escamotable du moule de façon à délimiter au moins deux compartiments de moulage adjacents,
  • remplir au moins un premier compartiment avec une première matière plastique, et laisser refroidir,
  • par des mouvements successifs des panneaux de l'au moins une paroi escamotable, escamoter ladite paroi pour l'amener dans une position de retrait,
  • remplir au moins un deuxième compartiment adjacent dudit premier compartiment avec une deuxième matière plastique, laisser refroidir et démouler la pièce.
The invention also relates to a method for manufacturing a plastic part comprising at least two adjacent parts made of plastics of different natures and / or colors by molding in a mold according to the invention. According to the method, one can:
  • at least one retractable wall of the mold is placed in the extension position so as to define at least two adjacent molding compartments,
  • fill at least a first compartment with a first plastic material, and allow to cool,
  • by successive movements of the panels of the at least one retractable wall, retracting said wall to bring it into a retracted position,
  • filling at least a second adjacent compartment of said first compartment with a second plastic material, allowing the room to cool and demold.

La pièce en matière plastique de forme non plane comportant au moins deux parties adjacentes, constituées de matière plastique de nature et/ou de couleurs différentes, peut avoir une zone de jonction délimitée par deux lignes non-rectilignes, en projection dans un plan de section transversale, ne se déduisant pas l'une de l'autre par translation, et constitue par exemple un élément de parement de l'intérieur ou de l'extérieur d'un véhicule automobile.The plastic part of non-planar shape comprising at least two adjacent parts, made of plastics material of nature and / or of different colors, may have a junction zone delimited by two non-rectilinear lines, in projection in a section plane transverse, not being deduced from each other by translation, and is for example a facing element of the inside or outside of a motor vehicle.

L'invention va maintenant être décrite de façon plus précise mais non limitative en regard des figures annexées dans lesquelles :

  • les figures 1A, B, C, D, sont des vues en perspective d'un moule pour moulage par injection d'une pièce en matière plastique comportant au moins deux parties adjacentes de natures et/ou de couleurs différentes, le moule comportant une paroi escamotable constituée de plusieurs panneaux mobiles ; la paroi escamotable est représentée dans différentes positions.
  • les figures 2A, 2B, 2C et 2D sont des vues en coupe du moule des figures 1A, B, C et D coupé par un plan passant par la paroi mobile du moule.
  • la figure 3 est une vue en perspective d'une pièce obtenue par moulage à l'aide du moule représenté aux figures 1A, B, C et D.
The invention will now be described in a more precise but nonlimiting manner with reference to the appended figures in which:
  • the Figures 1A , B, C, D, are perspective views of a mold for injection molding a plastic part comprising at least two adjacent parts of different natures and / or colors, the mold having a retractable wall consisting of several moving panels; the retractable wall is shown in different positions.
  • the Figures 2A, 2B, 2C and 2D are sectional views of the mold of Figures 1A , B, C and D cut by a plane passing through the movable wall of the mold.
  • the figure 3 is a perspective view of a part obtained by molding using the mold shown in FIGS. Figures 1A , B, C and D.

Le moule repéré généralement par 1 à la figure 1A, comporte une cavité de moulage 2 délimitée par une paroi non plane inférieure 3 et une paroi non plane supérieure 4 généralement parallèles entre elles.The mold usually spotted by 1 at the Figure 1A , has a molding cavity 2 delimited by a lower non-planar wall 3 and an upper non-planar wall 4 generally parallel to each other.

La cavité de moulage 2 est divisée par une paroi escamotable 5 en un premier compartiment de moulage 6, et un deuxième compartiment de moulage 7, alimentés chacun par un trou de coulée 8 pour le compartiment 6, et 9 pour le compartiment de moulage 7.The molding cavity 2 is divided by a retractable wall 5 into a first molding compartment 6, and a second molding compartment 7, each fed by a tap hole 8 for the compartment 6, and 9 for the molding compartment 7.

La paroi escamotable 5, en position d'extension comme représenté à la figure 1A ou à la figure 2A, est constituée de trois panneaux adjacents : deux panneaux d'extrémité 10 et 11, séparés par un panneau central 12. Les trois panneaux 10, 11 et 12 adjacents l'un à l'autre définissent une arête supérieure 13, qui vient en contact avec la paroi supérieure 4 du moule. Dans cette disposition, les deux compartiments de moulage 6 et 7 sont complètement séparés. On peut alors injecter une matière plastique par l'intermédiaire d'un premier trou de coulée 8 par exemple, comme indiqué par la flèche représentée à la figure 1A, pour former une première partie 15 d'une pièce en matière plastique.The retractable wall 5, in the extended position as shown in FIG. Figure 1A or at Figure 2A , consists of three adjacent panels: two end panels 10 and 11, separated by a central panel 12. The three panels 10, 11 and 12 adjacent to each other define an upper edge 13, which comes into contact with the upper wall 4 of the mold. In this arrangement, the two molding compartments 6 and 7 are completely separated. It is then possible to inject a plastic material via a first taphole 8 for example, as indicated by the arrow shown in FIG. Figure 1A to form a first part 15 of a plastic part.

Comme représenté à la figure 1B ou à la figure 2B, le panneau central 12 de la paroi escamotable 5, peut être déplacé vers le bas comme l'indique la flèche verticale, ce qui libère un espace entre les panneaux latéraux 10 et 11 et permet de les déplacer latéralement selon les deux flèches horizontales représentées à la figure 1B ou 2B pour les rapprocher l'un de l'autre.As represented in Figure 1B or at Figure 2B , the central panel 12 of the retractable wall 5 can be moved downwards as indicated by the vertical arrow, which frees a space between the side panels 10 and 11 and makes it possible to move them laterally along the two horizontal arrows shown in FIG. the Figure 1B or 2B to bring them closer to each other.

Le panneau mobile central 12 a une partie supérieure 12' dont la largeur est égale à deux fois l'épaisseur de la cavité de moulage 2 dans ses parties d'extrémité latérale, si bien que, une fois le panneau central 12 rétracté et les panneaux latéraux 10 et 11 rapprochés pour être mis au contact l'un de l'autre dans la partie centrale, l'ensemble des panneaux 10 et 11 peut être déplacé verticalement comme représenté aux figures 1C et 2C, par un mouvement selon les deux flèches verticales. A la suite de ce mouvement et comme représenté aux figures 1D ou 2D, les panneaux latéraux 10 et 11 forment alors une paroi escamotée dont l'arête supérieure 14 épouse exactement la forme de la paroi non plane inférieure 3 de la cavité de moulage 2. Dans cette disposition qui correspond à la position de retrait pour la paroi escamotable 5, l'arête supérieure 14 de la paroi escamotable en position de retrait vient compléter la paroi inférieure non plane 3 du moule.The central movable panel 12 has an upper portion 12 'whose width is twice the thickness of the molding cavity 2 in its lateral end portions, so that once the central panel 12 is retracted and the panels 10 and 11 closer to be brought into contact with each other in the central portion, all of the panels 10 and 11 can be moved vertically as shown in FIGS. Figures 1C and 2C , by a movement according to the two arrows vertical. As a result of this movement and as represented Figures 1D or 2D , the side panels 10 and 11 then form a retracted wall whose upper edge 14 fits exactly the shape of the lower non-planar wall 3 of the molding cavity 2. In this arrangement which corresponds to the retracted position for the retractable wall 5, the upper edge 14 of the retractable wall in the retracted position completes the non-flat bottom wall 3 of the mold.

Lorsque la paroi escamotable est escamotée, le deuxième compartiment de moulage 7 est délimité par les deux parois non planes 3 et 4 du moule, l'arête supérieure 14 de la paroi escamotable en position de retrait, et par la première partie 15 de la pièce qui est contenue dans le premier compartiment 6 dans lequel de la matière plastique a déjà été injectée. On peut alors injecter par le deuxième trou de coulée 9 une deuxième matière plastique de couleur ou de nature différente de la première matière plastique afin de constituer la deuxième partie de la pièce en matière plastique comportant deux parties de couleurs ou de natures différentes. Cette deuxième partie 16, vient se souder sur la première partie 15 de la pièce.When the retractable wall is retracted, the second molding compartment 7 is delimited by the two non-planar walls 3 and 4 of the mold, the upper edge 14 of the retractable wall in the retracted position, and by the first part 15 of the part which is contained in the first compartment 6 in which plastic has already been injected. It is then possible to inject by the second taphole 9 a second plastic material of different color or nature from the first plastic material in order to constitute the second part of the plastic part comprising two parts of different colors or natures. This second part 16, is welded on the first part 15 of the piece.

Pour fabriquer une pièce en matière plastique 30 comportant deux parties de natures ou de couleurs différentes ayant des surfaces non planes telles que représentées à la figure 3, on commence par séparer la cavité de moulage 2 en deux compartiments de moulage 6 et 7 en positionnant la paroi escamotable 5 en position d'extension. Dans cette position d'extension, la paroi escamotable 5 est constituée de trois panneaux adjacents, et son arête supérieure 13 vient en contact avec la paroi non plane supérieure 4 de la cavité de moulage 2. On injecte alors une première matière plastique par le premier trou de coulée 8 dans le premier compartiment 6, puis on laisse refroidir ou solidifier la matière plastique qui a été injectée pour constituer la première partie 15 de la pièce en matière plastique. On escamote alors la paroi 5 en l'amenant dans une position de retrait dans laquelle son arête supérieure 14 vient compléter la paroi non plane inférieure 3 de la cavité de moulage 2. Pour cela on modifie la forme de l'arête supérieure de la paroi escamotable en commençant par escamoter le panneau central 12, ce qui permet alors de rapprocher les deux panneaux latéraux 10 et 11 par un premier mouvement horizontal puis en déplaçant ces deux panneaux vers le bas par un deuxième mouvement vertical. Par ces opérations, on obtient une arête supérieure 14 de la paroi escamotable qui est à la fois continue et parfaitement adaptée à la paroi non plane inférieure 3 de la cavité de moulage 2. Dans cette disposition, le deuxième compartiment de moulage 7 est délimité à l'une de ces extrémités par la première partie 15 de la pièce en matière plastique. On injecte alors par le deuxième trou de coulée 9 une deuxième matière plastique qui est choisie de façon à être compatible et soudable avec la matière plastique de la première partie, mais qui peut avoir des propriétés différentes parce que on y a ajouté des additifs particuliers, ou qui peut être de couleur différente, ou qui peut à la fois être de couleur différente et avoir des additifs différents. Cette matière plastique injectée dans le deuxième compartiment forme la deuxième partie 16 de la pièce en matière plastique. Une fois que cette deuxième matière plastique a été complètement injectée dans le deuxième compartiment de moulage 7, on laisse refroidir l'ensemble, puis on démoule la pièce et on obtient ainsi une pièce comportant deux parties adjacentes en matière plastique ayant des couleurs et/ou des natures différentes.To manufacture a plastic part 30 having two parts of different natures or colors having non-planar surfaces as shown in FIG. figure 3 initially, the molding cavity 2 is separated into two molding compartments 6 and 7 by positioning the retractable wall 5 in the extended position. In this extended position, the retractable wall 5 consists of three adjacent panels, and its upper edge 13 comes into contact with the upper non-planar wall 4 of the molding cavity 2. A first plastic material is then injected by the first taphole 8 in the first compartment 6, and then allowed to cool or solidify the plastic material which has been injected to form the first part 15 of the plastic part. The wall 5 is then retracted by bringing it into a retracted position in which its upper edge 14 complements the lower non-planar wall 3 of the molding cavity 2. For this purpose, the shape of the upper edge of the wall is modified. retractable starting by retracting the central panel 12, which then allows to bring the two side panels 10 and 11 by a first horizontal movement and then moving these two panels down by a second vertical movement. By these operations, an upper edge 14 of the retractable wall is obtained which is both continuous and perfectly adapted to the lower non-planar wall 3 of the molding cavity 2. In this arrangement, the second molding compartment 7 is delimited at one of these ends by the first part 15 of the plastic part. The second pouring hole 9 is then injected with a second plastic material which is chosen to be compatible and weldable with the plastics material of the first part, but which may have different properties because special additives have been added thereto, or which may be of different color, or which may both be of different color and have different additives. This plastic material injected into the second compartment forms the second part 16 of the plastic part. Once this second plastic material has been completely injected into the second molding compartment 7, the assembly is allowed to cool, then the part is demolded, thereby obtaining a part comprising two adjacent plastic parts having colors and / or different natures.

Avantageusement, le refroidissement ou la solidification de la première matière plastique injectée est partielle, de telle manière que la première matière reste suffisamment ductile à coeur pour que, lors de l'injection de la deuxième matière, il se produit une interpénétration plus ou moins importante des deux matières.Advantageously, the cooling or solidification of the first injected plastic material is partial, so that the first material remains sufficiently ductile to the core so that, when the injection of the second material, there is a greater or lesser interpenetration of the two materials.

Selon un niveau de refroidissement croissant, on obtient une soudure, c'est-à-dire une interpénétration des deux matières ou un collage, c'est-à-dire une adhésion de surface entre les deux matières par fusion superficielle.According to an increasing level of cooling, a weld is obtained, that is to say an interpenetration of the two materials or a bond, that is to say a surface adhesion between the two materials by superficial melting.

Un autre paramètre déterminant la réalisation d'une soudure ou d'un collage, résulte des matériaux utilisés et de leur ductilité aux températures considérées. A titre d'exemple, le PP est plus fluide que l'ABS et à température équivalente, le PP forme une soudure alors que l'ABS forme un collage.Another parameter determining the realization of a weld or gluing results from the materials used and their ductility at the temperatures considered. For example, PP is more fluid than ABS and at equivalent temperature, PP forms a weld while ABS forms a bond.

On notera que les parois 3 ou 4 des premier et deuxième compartiments de moulage peuvent avoir par exemple des aspects de surface différent de façon à donner des aspects de poli ou de grainage différents pour les deux parties de la pièce en matière plastique.It should be noted that the walls 3 or 4 of the first and second molding compartments may have, for example, different surface aspects so as to give different polishing or graining aspects to the two parts of the plastic part.

On notera également que l'arête supérieure 13 de la paroi escamotable 5, lorsque cette paroi est en position d'extension, comporte trois portions non colinéaires qui sont d'une part un segment central 20, et d'autre part deux arcs terminaux latéraux 21 et 22, qui s'étendent dans des directions perpendiculaires au segment central 20. De même, l'arête inférieure 14 de la paroi escamotable 5, lorsqu'elle est en position de retrait, comporte trois portions non colinéaires, qui sont d'une part un segment central 20', et d'autre part deux arcs terminaux latéraux 21' et 22' qui sont non colinéaires avec le segment central 20'. On notera en particulier que les segments 20 et 20' sont parallèles l'un à l'autre, mais que le segment 20' est plus court que le segment 20, et que les arcs terminaux 21' et 22' peuvent se déduire des arcs terminaux 21 et 22 par des translations. C'est du fait de ces dispositions que la cavité de moulage 2 peut être parfaitement séparée par une paroi escamotable 5 à géométrie variable telle qu'elle vient d'être décrite.It will also be noted that the upper edge 13 of the retractable wall 5, when this wall is in the extended position, comprises three non-collinear portions which are on the one hand a central segment 20, and on the other hand two lateral terminal arcs. 21 and 22, which extend in directions perpendicular to the central segment 20. Similarly, the lower edge 14 of the retractable wall 5, when in the retracted position, comprises three non-collinear portions, which are one part a central segment 20 ', and secondly two lateral terminal arcs 21' and 22 'which are non-collinear with the central segment 20'. It will be noted in particular that the segments 20 and 20 'are parallel to one another, but that the segment 20' is shorter than the segment 20, and that the terminal arcs 21 'and 22' can be deduced from the arcs terminals 21 and 22 by translations. It is because of these provisions that the molding cavity 2 can be perfectly separated by a retractable wall 5 variable geometry as just described.

Le moule qui vient d'être décrit comporte deux compartiments de moulage adjacent permettant de réaliser une pièce comportant deux parties adjacentes de natures et/ou de couleurs différentes. Mais il est évident que l'on peut envisager un moule comportant plus de deux compartiments de moulage adjacent séparés deux à deux par des parois escamotables. On peut ainsi réaliser des pièces en matière plastique comportant plus de deux parties adjacentes de natures et/ou de couleurs différentes, et par exemple trois parties adjacentes ou quatre parties ou même plus.The mold which has just been described has two adjacent molding compartments making it possible to produce a part comprising two adjacent parts of different natures and / or colors. But it is obvious that one can envisage a mold having more than two adjacent molding compartments separated in pairs by retractable walls. It is thus possible to produce plastic parts comprising more than two adjacent parts of different natures and / or colors, and for example three adjacent parts or four parts or even more.

De même la forme de la pièce 30 telle qu'elle est représentée à la figure 3 est une pièce comportant une paroi constituée d'un panneau plan terminé par des bordures latérales arrondies s'étendant perpendiculairement à la ligne de liaison entre les deux parties de natures ou de couleurs différentes. Mais, il est possible de réaliser des pièces ayant des formes différentes et comportant par exemple plusieurs panneaux-plan adjacents orientés chacun dans une direction particulière. Une telle pièce comportant plusieurs panneaux plans mais qui ne sont pas parallèles les uns aux autres, est une pièce non plane qui pour être moulée dans un moule constitué d'une cavité de moulage pouvant être séparée en plusieurs compartiments par au moins une paroi escamotable nécessite également des parois escamotables constituées de plusieurs panneaux mobiles les uns par rapport aux autres pouvant être déplacés de façon à former des parois ayant une première forme dans une position d'extension et une forme différente dans une position de retrait. L'homme du métier saura au cas par cas définir les parois escamotables constituées de panneaux adaptés pour pouvoir assurer cette évolution de géométrie nécessaire entre les positions d'extension et les positions de retrait.Similarly, the shape of the piece 30 as shown in FIG. figure 3 is a part comprising a wall consisting of a flat panel terminated by rounded lateral edges extending perpendicular to the connecting line between the two parts of natures or of different colors. However, it is possible to produce pieces having different shapes and comprising, for example, several adjacent planar panels each oriented in a particular direction. Such a part comprising several flat panels but which are not parallel to each other, is a non-planar part which, to be molded in a mold consisting of a molding cavity that can be separated into several compartments by at least one retractable wall, requires also retractable walls consisting of a plurality of panels movable relative to each other movable to form walls having a first shape in an extended position and a different shape in a retracted position. The person skilled in the art will know, on a case-by-case basis, how to define the retractable walls made up of panels adapted to be able to ensure this necessary evolution of geometry between the extension positions and the withdrawal positions.

Le procédé qui vient d'être décrit peut être utilisé pour fabriquer une grande variété de pièces en matière plastique comportant plusieurs parties adjacentes constituées de matières plastiques compatibles et assemblées entre elles par soudage ou par collage, mais de natures et/ou de couleurs différentes. Ces pièces sont par exemple des pièces de tableaux de bord d'automobiles, ou des pièces de parement intérieur de portière d'automobiles, ou tout autre pièce en matière plastique d'intérieure ou d'extérieure d'automobiles.The method which has just been described can be used to manufacture a wide variety of plastic parts comprising several adjacent parts made of compatible plastics and assembled together by welding or gluing, but of different natures and / or colors. These parts are for example parts of automotive dashboards, or parts of interior door siding of automobiles, or any other piece of plastic interior or exterior of automobiles.

Le procédé et le moule qui viennent d'être décrits sont plus particulièrement intéressants pour fabriquer des pièces comportant au moins deux parties de natures ou de couleurs différentes ayant des surfaces non-planes et dans lesquelles, en outre, ces deux parties ont une zone de jonction délimitée par des lignes sur les parois supérieure et inférieure de la pièce, non-rectilignes, en projection orthogonale sur un plan de section transversale (plan de la Figure 3), et ne pouvant pas se déduire l'une de l'autre par une translation parallèle au plan de déplacement des panneaux jointifs de la paroi escamotable du moule. En particulier, une telle ligne de jonction non-rectiligne pourra être, en projection, au moins partiellement courbe ou en ligne brisée.The method and the mold which have just been described are more particularly of interest for making parts comprising at least two parts of different natures or colors having non-planar surfaces and in which, moreover, these two parts have a zone of junction delimited by lines on the upper and lower walls of the part, non-rectilinear, in orthogonal projection on a cross-sectional plane (plane of the Figure 3 ), and can not be deduced from each other by a translation parallel to the plane of movement of the contiguous panels of the retractable wall of the mold. In particular, such a non-rectilinear junction line may be, in projection, at least partially curved or broken line.

Le plan de section transversale est un plan s'étendant selon l'épaisseur de la pièce, contenant au moins partiellement la surface de jonction.The cross-sectional plane is a plane extending according to the thickness of the part, at least partially containing the joining surface.

Une telle pièce à zone de jonction non-rectiligne a été représentée sur la Figure 3.Such a piece with a non-rectilinear junction zone has been represented on the Figure 3 .

En projection orthogonale sur un plan perpendiculaire au plan de section transversale précité, la zone de jonction peut avoir une forme quelconque, pourvu qu'elle soit compatible avec les mouvements de la paroi escamotable. L'homme du métier sait déterminer ces conditions de compatibilité.In orthogonal projection on a plane perpendicular to the above-mentioned cross-sectional plane, the junction zone may have any shape, provided that it is compatible with the movements of the retractable wall. Those skilled in the art know how to determine these compatibility conditions.

Claims (7)

  1. A mould for injection moulding a part of plastics material (30) comprising at least two adjacent parts (15, 16) comprising two compatible plastics materials assembled together by welding or adhesive bonding, of different kinds and/or colours, the mould (1) comprising a mould cavity (2) bounded by at least two non-planar walls (3, 4) and at least one retractable wall (5) which can move between an extended position and a retracted position enabling to divide mould cavity (2) into at least two compartments (6, 7) which can be separately fed with plastics material, characterised in that in the extended position the retractable wall (5) has a non-rectilinear edge (13) acting together with a wall (4) of the mould cavity without any play, and in that the retractable wall comprises a plurality of panels (10, 11, 12) which are contiguous in at least the extended position or the retracted position, said panels (10, 11, 12) being able to move in relation to each other in such a way as to modify the shape of the non-rectilinear edge of the retractable wall to adjust it to the shape of a second wail (3) of the mould cavity (2) when in the retracted position.
  2. A mould according to claim 1, characterised in that the edge (13) of the retractable wall (5) comprises at least three non-co-linear portions (20, 21, 22) and in that the retractable wall comprises at least one panel (10, 11) which can be moved between the extended position and the retracted position by two successive movements in two different directions.
  3. A mould according to claim 2, characterised in that the edge of the retractable wall (13) comprises a central portion (20) in the form of a segment which is prolonged at its two extremities by terminal arcs (21, 22) which are not co-linear with the central segment, and in that in the extended position the retractable wall comprises two lateral panels (30, 11) separated by a retractable central panel (12), the lateral panels (10, 11) being capable of moving in two perpendicular directions so as to be moved into a retracted position by two successive movements in two different directions.
  4. A mould according to any one of claims 1 to 3, characterised in that it comprises a plurality of retractable walls
  5. A process for manufacturing a part of plastics material (30) comprising at least two adjacent parts (15, 16) comprising plastics material of different kinds and/or colours by moulding in a mould (1) according to any one of claims 1 to 4, characterised in that
    - at least one retractable wall (5) of the mould (1) is placed in the extended position in such a way as to bound at least two adjacent mould compartments (6, 7),
    - at least one first compartment (6) is filled with a first plastics material, and allowed to cool,
    - as a result of successive movements of the panels (10, 11, 12) of at least one retractable wall (5) the said wall is retracted in order to move it into a retracted position,
    - at least one second compartment (7) adjacent to the first compartment (6) is filled with a second plastics material and allowed to cool, and then the part is turned out.
  6. A process according to claim 5, characterised in that the first plastics material is allowed to cool partly before the said at least second compartment is filled with the second plastics material.
  7. A process according to claim 5 or claim 6, characterized in that, the part of plastics material comprises a junction zone bounded by two non-rectilinear lines projecting in a transversal cross-sectional plane and which are not derived from each other by translational movement, said part forming a trim element of the interior or the exterior of a motor vehicle.
EP05798601A 2004-08-18 2005-08-18 Mould for the injection moulding of a plastic piece and moulding method Not-in-force EP1778451B1 (en)

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FR0408963A FR2874350B1 (en) 2004-08-18 2004-08-18 MOLD FOR INJECTION MOLDING OF A PLASTIC PIECE AND MOLDING METHOD
PCT/FR2005/002112 WO2006021697A1 (en) 2004-08-18 2005-08-18 Mould for the injection moulding of a plastic piece and moulding method

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US7695270B2 (en) 2010-04-13
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KR20070047348A (en) 2007-05-04
EP1778451A1 (en) 2007-05-02
BRPI0515214A (en) 2008-07-08
PT1778451E (en) 2011-10-24
JP2008509830A (en) 2008-04-03
US20070292637A1 (en) 2007-12-20
ATE528119T1 (en) 2011-10-15
KR101182339B1 (en) 2012-09-20
FR2874350A1 (en) 2006-02-24
WO2006021697A1 (en) 2006-03-02
BRPI0515214B1 (en) 2015-10-27
CN101027173A (en) 2007-08-29
CN101027173B (en) 2010-05-05
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RU2007109777A (en) 2008-09-27
RU2370366C2 (en) 2009-10-20

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